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Exposure times

Table 1 below shows the time taken for the background (sky + telescope) to reach 50% full-well capacity of the NIRI Aladdin array in spectroscopy mode. Table 2 shows the brightness of a stellar source (in magnitudes) that will fill 80% of the well of a NIRI array pixel in a one-second exposure (0.2 sec exposure at M).

Target Component

The specification of the Target component differs somewhat depending on whether a Natural Guide Star (NGS) or the Laser Guide Star (LGS) is being employed. There also can be differences in the target component, depending on whether NIRI or NIFS is being used, since the NIFS OIWFS can be employed to provide tip/tilt information.

testing

Michelle Component

Michelle iterator

Michelle Iterator

Visualisation in the Position Editor and selection of guide stars

Observation Preparation

This section explains how to configure ALTAIR in the Observing Tool and how to specify the AO and tip/tilt star in the "Target Component" when ALTAIR is being used.


Optomechanical Overview

Altair Optomechanical Overview



Optical path including the common path and the NGS WFS path Altair NGS WFS optical path

CAD plot of the optical bench + electronic enclosure + ISS mounting

ISS+Altair CAD

Documents

Papers describing aspects of ALTAIR include:

Optical/Mechanical Layout